Pleeease i need asapwhy did scientists struggle for thousands of years to accurately describe the solar system? venus has phases like the moon. many people spoke italian and did not understand latin. the planets appeared to move backward in the sky occasionally. scientists could not explain why the sun appeared to rise and set every day.

The planets appeared to move backward in the sky occasionally.

The correct answer is option C

During 18th century the people used to think that the planets used to move backward in the sky and this is known as the Apparent retrograde motion.

The planets of the solar system appeared to be moving in backward direction.

At that time it was not explained properly that it seems to moving backward but actually it is not. Planets move around their respective orbits only.